Picnic box



FIG. 1 is a top plan view of a picnic box showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a right side elevational view thereof, the opposite side being a mirror image;

FIG. 4 is a front elevation view thereof, the opposite side being a mirror image;

FIG. 5 is an exploded front elevational view thereof;

FIG. 6 is an exploded right side elevational view thereof; and

FIG. 7 is a perspective view thereof. 

The ornamental design for a picnic box, as shown and described. 